#include<iostream>
int main()
{
	using std::cout;
	int a=20;
	int b=20;
	cout<<"a   = "<<a<<": b  = "<<b<<"\n";
	cout<<"a++ = "<<a++<<": ++b= "<<++b<<"\n";
	cout<<"a   = "<<a<<": b = "<<b<<"\n";
	return 0;
}
